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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Rear End Wiggle on Bumps



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      10-23-2014, 01:51 PM   #23
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Quote:
Originally Posted by JStang View Post
I recently had new Michelin PSS's put on and since have noticed that the back end seems to move a little side to side when one wheel hits a bump in the road. I haven't noticed this if both wheels hit a bump.

What could be the cause? Worn subframe bushings, struts going bad, control arm bushings, bump stops etc? It's really an odd feeling.

Replace those wimp stock subframe bushings w/M3 - ~$260 parts. Use HP Autowerks' subframe bushing tool - rents for, what, $55?

Distinct improvement! Now start saltin' away that spare change for a LSD....
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      10-23-2014, 02:17 PM   #24
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I replaced the rear traction strut and upper control arm recently but couldn't tighten the bolts and nuts properly given the space. it's something like 79 lbft at the subframe and 125 lbft at the hub. I experienced the same loose wiggling rear end.

I wasn't going to buy tools just to do this job - I took it to midas and they torqued them to spec for $30. Problem gone.

I'm sure subframe bushings and m3 susp components will solve the problem too, but this is what did worked for me.

If you need more details, PM me.
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      10-23-2014, 02:30 PM   #25
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Quote:
Originally Posted by whosdady View Post
I have this wobble/wiggle and I have the 235F/265R PS2 tires as well. My suspension has been replaced 100%. Ohlins, Power Flex, M3, OS Giken, Megan, etc... I have had 6 different alignments and my car pulls/steers to the right under hard acceleration. It drives completely straight under normal acceleration. The only thing I don't have is a lockdown kit or brace.

This is not the first time I have heard of issues with the PS2's. SteveAZ had similar issues prior to changing tires...
Scott, you have PSS
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      10-23-2014, 06:45 PM   #26
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Thanks Rob. You're right, I have the new PSS which are the replacements for the PS2's.
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      10-28-2014, 07:36 PM   #27
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Quote:
Originally Posted by DrRobert View Post
IME my 335 had two distinctly different types of rear bounce. See my post #41 in this thread for my detailed description:

http://www.e90post.com/forums/showthread.php?t=1024256

Based on the photo of the kitty (sideways rear end wiggle going over a bump while turning) I would agree you are most likely feeling the inherent weakness of the stock subframe bushings. That is an expensive repair though (if you are paying someone to do it for you), so I'd make sure you are talking about the same rear bounce as the other people who have replied. If it is more of an up and down rear bounce when going over bumps I'd have a look at your dampers.
From what I understand, the subframe inserts by Whiteline is a simple, straightforward job. If you opt for M3 bushings, well, that's a whole lot more involved.
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      08-15-2019, 09:42 PM   #28
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Just installed the subframe bushing inserts (whiteline). Definitely improved the left /right wiggle/slop quite a bit on my tired originals. I think I'm going to do the m3s this fall when I swap my winters on though. There's still enough wiggle that I notice it.
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      08-19-2019, 03:14 AM   #29
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Quote:
Originally Posted by JStang View Post
to move a little side to side when one wheel hits a bump in the road. I haven't noticed this if both wheels hit a bump.
Worn subframe bushings, replace them with after-market or M3. I has helped a lot for me but I still had rear steering when on/off WOT. I have solved it by lock-down kit.
Rear M3 arms has not changed it too much, toe-arms with solid joints also just a minor improvement.
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      08-22-2019, 05:13 PM   #30
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+1 for rsfb, but also alignment... Make sure you take it to a shop who knows what they're up to. A piece of string would also be a good ballpark check.

I did M3 rsfb recently, and it was a hell of a job...not fun! If you're going to do it yourself, spend the money on buying or renting the proper bushing press - it's worth it! Also I can hear my diff now, faintly.
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      08-26-2019, 03:22 AM   #31
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I don´t hear the diff at all, no even with that lock-down connection (I was kinda of afraid of that direct link between diff case and support frame)...
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      08-26-2019, 05:28 AM   #32
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Yeah, I should probably change the oil in mine (130k miles old...)
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      08-28-2019, 12:07 AM   #33
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Quote:
Originally Posted by AWD Addict View Post
Just installed the subframe bushing inserts (whiteline). Definitely improved the left /right wiggle/slop quite a bit on my tired originals. I think I'm going to do the m3s this fall when I swap my winters on though. There's still enough wiggle that I notice it.
Go with aluminum. No nvh and keeps everything FIRM in the rear
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